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Change brake fluid > < Bleeding the brake system of air with the brake filling and bleeding device

Octavia Mk2

Bleeding the brake system of air without using the brake filling and bleeding device
Bleeding the brake system of air without using the brake filling and bleeding device
Special tools and workshop equipment required
t  Bleeding bottle (commercially available)
t  Brake fluid → Chapter
  WARNING
t  Brake fluid is hygroscopic, i.e. it retains humidity from the ambient air, and must therefore always be stored in airtight containers.
t  Brake fluid must never come into contact with fluids containing mineral oils (oil, petrol, cleaning agent). Mineral oils damage the plugs and boots of the brake system.
t  Drained (used) brake fluid must never be used again.
t  Brake fluid is toxic, avoid skin contact.
t  Because of its caustic effect brake fluid must not come into contact with paint.
t  Rinse any brake fluid spills with a lot of water.
t  Dispose of brake fluid in compliance with the applicable waste disposal and environmental regulations.
t  Bleeding brake system on vehicles with ABS or TCS/ESP, as for vehicles without ABS.
t  Only use new brake fluid in accordance with the specification → Chapter.
t  While bleeding continuously check the brake fluid level in the brake fluid reservoir and top up brake fluid if necessary up to the „MAX“ marking.
–  Remove the dust caps of the bleeder screws at the brake calipers.
–  Provide a suitable catch pan for used brake fluid.
–  Build up pressure in the brake system by pumping repeatedly the brake pedal.
   
–  Fit the hose of the bleeding bottle-1- onto the corresponding bleeder screw.
–  Press brake pedal and then loosen the corresponding bleeder screw.
By doing so, the procedure for bleeding the brakes is performed.
–  Tighten the corresponding bleeder screw with the brake pedal pressed down.
–  Release brake pedal.
–  Repeat this procedure until even the smallest air bubbles have escaped from the system.
–  Close the relevant bleeder screw and fit on dust cap.
–  Repeat this procedure for all brake calipers in the prescribed sequence until the brake system is fully bled.
Bleeding sequence
1.  Rear right brake caliper
2.  Rear left brake caliper
3.  Front right brake caliper
4.  Front left brake caliper
–  Inspect pedal position and idle travel at brake pedal. Idle travel: max. 1/3 of pedal travel.
–  Repeat the whole procedure if necessary (several times), until perfect bleeding is achieved.
Vehicles with ABS
  Caution
Before the basic setting of the ABS control unit is performed, first of all the brake system must be fully bled until even the smallest air bubbles have escaped from the system.
The air bubbles would penetrate into the ABS hydraulic unit when performing the basic setting of the ABS control unit.
It is very difficult to remove these air bubbles from the ABS hydraulic unit.
–  Perform basic setting of the ABS control unit using the diagnostic unit -VAS - → Vehicle diagnostic tester.
Continued for all vehicles
–  Perform a test drive. While doing so, at least one ABS adjustment must be carried out on vehicles with ABS!
  A02-0334

Change brake fluid > < Bleeding the brake system of air with the brake filling and bleeding device